| /* |
| * Copyright (c) 2019 Peter Bigot Consulting, LLC |
| * Copyright (c) 2016 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <errno.h> |
| |
| #include <kernel.h> |
| #include <drivers/i2c.h> |
| #include <init.h> |
| #include <sys/byteorder.h> |
| #include <sys/__assert.h> |
| #include <logging/log.h> |
| |
| #include "mcp9808.h" |
| |
| LOG_MODULE_REGISTER(MCP9808, CONFIG_SENSOR_LOG_LEVEL); |
| |
| int mcp9808_reg_read(struct device *dev, u8_t reg, u16_t *val) |
| { |
| const struct mcp9808_data *data = dev->driver_data; |
| const struct mcp9808_config *cfg = dev->config->config_info; |
| int rc = i2c_write_read(data->i2c_master, cfg->i2c_addr, |
| ®, sizeof(reg), |
| val, sizeof(*val)); |
| |
| if (rc == 0) { |
| *val = sys_be16_to_cpu(*val); |
| } |
| |
| return rc; |
| } |
| |
| static int mcp9808_sample_fetch(struct device *dev, enum sensor_channel chan) |
| { |
| struct mcp9808_data *data = dev->driver_data; |
| |
| __ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_AMBIENT_TEMP); |
| |
| return mcp9808_reg_read(dev, MCP9808_REG_TEMP_AMB, &data->reg_val); |
| } |
| |
| static int mcp9808_channel_get(struct device *dev, |
| enum sensor_channel chan, |
| struct sensor_value *val) |
| { |
| const struct mcp9808_data *data = dev->driver_data; |
| int temp = mcp9808_temp_signed_from_reg(data->reg_val); |
| |
| __ASSERT_NO_MSG(chan == SENSOR_CHAN_AMBIENT_TEMP); |
| |
| val->val1 = temp / MCP9808_TEMP_SCALE_CEL; |
| temp -= val->val1 * MCP9808_TEMP_SCALE_CEL; |
| val->val2 = (temp * 1000000) / MCP9808_TEMP_SCALE_CEL; |
| |
| return 0; |
| } |
| |
| static const struct sensor_driver_api mcp9808_api_funcs = { |
| .sample_fetch = mcp9808_sample_fetch, |
| .channel_get = mcp9808_channel_get, |
| #ifdef CONFIG_MCP9808_TRIGGER |
| .attr_set = mcp9808_attr_set, |
| .trigger_set = mcp9808_trigger_set, |
| #endif /* CONFIG_MCP9808_TRIGGER */ |
| }; |
| |
| int mcp9808_init(struct device *dev) |
| { |
| struct mcp9808_data *data = dev->driver_data; |
| const struct mcp9808_config *cfg = dev->config->config_info; |
| int rc = 0; |
| |
| data->i2c_master = device_get_binding(cfg->i2c_bus); |
| if (!data->i2c_master) { |
| LOG_DBG("mcp9808: i2c master not found: %s", cfg->i2c_bus); |
| return -EINVAL; |
| } |
| |
| #ifdef CONFIG_MCP9808_TRIGGER |
| rc = mcp9808_setup_interrupt(dev); |
| #endif /* CONFIG_MCP9808_TRIGGER */ |
| |
| return rc; |
| } |
| |
| static struct mcp9808_data mcp9808_data; |
| static const struct mcp9808_config mcp9808_cfg = { |
| .i2c_bus = DT_INST_0_MICROCHIP_MCP9808_BUS_NAME, |
| .i2c_addr = DT_INST_0_MICROCHIP_MCP9808_BASE_ADDRESS, |
| #ifdef CONFIG_MCP9808_TRIGGER |
| .alert_pin = DT_INST_0_MICROCHIP_MCP9808_INT_GPIOS_PIN, |
| .alert_flags = DT_INST_0_MICROCHIP_MCP9808_INT_GPIOS_FLAGS, |
| .alert_controller = DT_INST_0_MICROCHIP_MCP9808_INT_GPIOS_CONTROLLER, |
| #endif /* CONFIG_MCP9808_TRIGGER */ |
| }; |
| |
| DEVICE_AND_API_INIT(mcp9808, DT_INST_0_MICROCHIP_MCP9808_LABEL, mcp9808_init, |
| &mcp9808_data, &mcp9808_cfg, POST_KERNEL, |
| CONFIG_SENSOR_INIT_PRIORITY, &mcp9808_api_funcs); |